Math

Bitesize Math - http://www.bbc.co.uk/schools/ks2bitesize/maths - Interactive activities for math
Create-a-graph - http://nces.ed.gov/nceskids/createAgraph/default.aspx - Create bar, line, area, pie, and XY graphs quickly online.
MAP math - http://www.sowashco.k12.mn.us/ro/pages/studentlinks/map - Interactive websites correlated to MAP scores
Multiplication Cloud Click - http://www.echalk.co.uk/tasters/taster3/taster.html
Multiplication Grand Prix - http://arcademicskillbuilders.com/games/grand_prix/grand_prix.html - Multiplication racing game.
Pentominoes - http://www.scholastic.com/blueballiett/games/pentominoes_game.htm - Drag and drop shapes to make them fit into a grid.
sketchfu - http://sketchfu.com/home- Online whiteboard. Draw images for play-back. Create a class account for students to log in and share drawings of story maps, processes, solving problems, and drawings.
Solving 3 Step Equations - http://www.ccnymath.com/mathpages/Stan_LEQ3Step/fig.swf - Interactive guide for solving equations.